349 results about "Optical coating" patented technology

The invention provides an artificial intelligence-based optical coating quality monitoring method, which comprises the following steps of: 1, acquiring visual image data of the surface of a coating substrate in real time by using a common industrial camera in an optical coating process; 2, preprocessing the collected image data, and extracting visual feature information representing the state of the film layer; 3, inputting the extracted feature information into a pre-trained artificial intelligence analysis model for simulating artificial experience judgment; step 4, outputting an evaluation result of the current coating quality by the artificial intelligence analysis model, wherein the evaluation result comprises identification of film layer uniformity, thickness trend and potential defects; and 5, generating a process adjusting instruction according to the evaluation result, feeding back the process adjusting instruction to a control system of the coating equipment, and dynamically adjusting process parameters to realize closed-loop optimization control.

The invention discloses a holographic projection system based on an AI large model. According to the invention, through the nano-scale optical coating and environment self-adaptive adjustment technology, harmful blue light is effectively filtered, environment light parameters are dynamically matched, the problem that eyes are injured by a common screen is solved, and the method is especially suitable for long-time learning scenes of children. The holographic projection core module adopts a naked eye 3D light field technology, presents complex models such as dinosaur, marine organisms and the like in a three-dimensional suspension manner through high-fidelity color restoration and dynamic depth-of-field adjustment capability, and is matched with gesture touch control and voice instructions of multi-mode interaction hardware, so that a user can directly touch a virtual object, and the real-time performance of the virtual object is improved. Experience upgrading from plane observation to space interaction is achieved, and knowledge such as English learning and animal and plant cognition is converted into interactive games and story narration through virtual teacher images and scene scripts. The autistic children can complete social dialogue training under the guidance of the virtual role, the system analyzes emotion fluctuation in real time and adjusts a guidance strategy, and social fear is gradually eliminated.

The invention discloses a preparation method of a photoresponsive self-cleaning optical coating with a dynamic self-repairing function. The preparation method comprises the following steps: adding a monomer containing a Diels-Alder reaction bond into a polyurethane prepolymer, and reacting to obtain the polyurethane elastomer with self-repairing capability. An azobenzene derivative is connected to a polyurethane elastomer through a covalent bond, and the photoresponsive self-repairing polymer is obtained. Hydrophobically modified TiO2 nanoparticles are prepared in situ through a sol-gel method. In order to further improve the dispersity of the TiO2 nanoparticles in the polymer, a silane coupling agent is adopted to carry out surface modification on the TiO2 nanoparticles. The preparation method comprises the following steps: mixing a photoresponsive self-repairing polymer and a TiO2 nanoparticle dispersion liquid in proportion, uniformly stirring, coating the mixed liquid on the surface of a base material, forming a uniform coating through a brush coating or spray coating method, and curing the coating at a proper temperature. Due to the excellent characteristics of light response self-repairing, ultraviolet resistance, wear resistance and the like, the coating can keep a long transparent period and good antifouling durability in an outdoor environment.

An electronic device is provided. The electronic device includes a ring-shaped housing having an inner surface into which a finger of a user is inserted, a light-emitting unit configured to emit a light to the inner surface of the housing through a first region of the inner surface of the housing within the housing, a light-receiving unit configured to receive first light, which is a portion of the light reflected from an inside of the finger of the user, through a second region of the inner surface of the housing within the housing, and a coating layer, disposed between the first region and the second region, configured to reflect second light, which is distinct from the first light and is remaining portion of the light, to the finger of the user to transmit the second light to the light-receiving unit.

The invention relates to the technical field of vacuum coating, in particular to double-sided optical coating equipment capable of automatically loading and unloading umbrellas, which comprises a machine body, and a vacuum coating mechanism, a loading and unloading mechanism and a revolution module which are arranged on the machine body, the vacuum coating mechanism is used for carrying out vacuum coating on products in the umbrellas on the revolution module; the loading and unloading mechanism is used for loading and unloading the umbrellas on the revolution module; the feeding and discharging mechanism comprises a feeding and discharging lifting module, a feeding and discharging transverse moving module and an umbrella taking and placing module, the feeding and discharging lifting module is used for driving the umbrella taking and placing module to ascend and descend, the feeding and discharging transverse moving module is used for driving the umbrella taking and placing module to transversely move, and the umbrella taking and placing module is used for picking up umbrellas and adjusting the included angles between the umbrellas and the horizontal plane. Therefore, the umbrella adapts to the mounting station of the revolution module.

The invention relates to the technical field of optical coating materials, and particularly discloses a trititanium pentoxide optical coating material and a preparation process thereof. The invention relates to a preparation process of a trititanium pentoxide optical coating material, which comprises the following specific steps: mixing titanium dioxide and titanium powder by using a dry method, then carrying out hydraulic pressure, then carrying out vacuum sintering, cooling, then taking out trititanium pentoxide sintered crystals, then carrying out surface modification on the trititanium pentoxide sintered crystals and a titanate coupling agent, and finally carrying out vacuum sintering to obtain the trititanium pentoxide optical coating material. Drying and crushing to obtain a trititanium pentoxide finished product; and mixing the trititanium pentoxide finished product with silicon dioxide and aluminum oxide, and sintering to form the trititanium pentoxide optical coating material. Under the synergistic effect of all processes and raw materials, prepared trititanium pentoxide finished product particles are promoted to form a more compact sintered body, a uniform and stable interface is formed in the coating process, and the bonding strength and wear-resistant stability of the coating material are improved.

The invention provides a folded optical path lens, an optical imaging system and a head-mounted display device. The folded optical path lens comprises: a first lens having a first surface and a second surface arranged oppositely, the first surface being a convex surface; the light splitting film is arranged on the first surface, the difference value between the reflectivity and the transmissivity of the light splitting film is smaller than or equal to 20%, the light splitting film comprises multiple optical coating layers which are arranged in a stacked mode, and the multiple optical coating layers comprise at least one non-metal transparent coating and at least one metal layer. Through the arrangement of the metal layer, the consistency of the transmittance of the folded light path lens to obliquely-incident light component s polarized light and p polarized light can be improved, then the ovality of the folded light path lens is effectively improved, the ovality of the folded light path lens is closer to 1, and then ghosting and stray light of the folded light path lens can be effectively reduced.

The invention provides an ultra-pure thorium fluoride production process which comprises the following steps: preparing a nanoscale ThF4.xNH4F precursor through a gas-liquid-solid three-phase reaction, atomizing an ammonium fluoride solution into microdroplets by adopting ultrasonic atomization, and carrying out synergistic reaction with gaseous ammonium fluoride and a liquid-phase thorium nitrate solution; a microwave-plasma synergistic fluorination reaction is adopted, and the precursor is heated in a high-purity inert atmosphere to generate crude thorium fluoride; according to the ultra-pure thorium fluoride production process provided by the invention, the purity of thorium fluoride is remarkably improved through the technical means of preparation of a nanoscale precursor through a gas-liquid-solid three-phase reaction, microwave-plasma synergistic fluorination, multi-stage sublimation combined with graphene-based nano trapping membrane purification, intelligent process control, by-product closed-loop recovery and the like; the impurity content is low, and the requirements of nuclear reactor fuel substrates and high-end optical coatings on ultra-high purity are met. The method has the advantages of high yield, high process stability and small purity fluctuation among batches, and the production efficiency and the product consistency are obviously improved.

The invention is applicable to the field of cover plate glass processing, and provides a method for processing and preparing a cover plate glass with a superhard optical coating, which comprises the steps of glass substrate pretreatment, multi-layer superhard coating layer preparation, AF anti-fingerprint film preparation and post-treatment detection. According to the invention, the glass substrate is subjected to basic pretreatment (cleaning and plasma treatment), the Mohs hardness of the superhard coating layer can reach 5 when an evaporation process is adopted, and the Mohs hardness can reach 6 when a sputtering process is adopted; the initial water drop angle is larger than or equal to 115 degrees, the water drop angle is still larger than or equal to 102 degrees after 2500 times of friction tests, and the rubber friction tests can reach more than 6300 times; the total thickness of the film layer is controlled to be 30-100 nm, the film layer is adaptive to cover plate glass with different sizes of more than 1-20 inches (small-size adaptive evaporation / sputtering and large-size adaptive magnetron sputtering), the process is compatible with a continuous film coating line, and the film layer is suitable for processing of intelligent watch glass, intelligent mobile phones and small-size touch screen cover plate glass and has good practicability and mass production potential.

The present application provides a single planetary fixture for coating large-aperture optical elements and a vacuum coating machine, which are applied to the field of large-aperture coating equipment design and optical coating process technology, and include: a revolving umbrella frame, a single planetary umbrella frame and a counterweight module; the revolving umbrella frame is installed inside the vacuum chamber of the vacuum coating machine through a revolving axis; the single planetary umbrella frame is arranged below the revolving umbrella frame, wherein the single planetary umbrella frame is installed and connected to the revolving umbrella frame through a first rotation axis; the counterweight module is arranged above the revolving umbrella frame, and the counterweight module is installed and connected to the revolving umbrella frame through a second rotation axis, and is used to balance the torque of the single planetary umbrella frame; the single planetary fixture requires a small number of moving parts and a low complexity of the mechanical system, which effectively reduces the diameter of the vacuum chamber of the required coating machine, thereby reducing the size of the entire coating machine, reducing the manufacturing, operation and maintenance costs of the coating machine, and allowing the user to quickly and accurately counterweight according to specific application requirements, thereby solving the problem of counterweight during coating.

Methods and systems for producing an optical construction on a optical substrate, one such method including: (a) microvalving drops of a liquid, dye-containing formulation onto an optical surface of the optical substrate, to form a wet continuous layer; and (b) treating the wet layer to produce a continuous, dried dye containing layer on the optical surface, wherein the optical surface is a curved surface, and wherein the optical surface is a polymeric surface.

The invention relates to the technical field of optical coating, in particular to a partitioned coating method for a spatial extreme ultraviolet band reflector, which aims to coat different or same films on more than two or more regions at certain intervals. The method comprises the following steps: firstly, designing more than two or more EUV wave band multilayer films, wherein the structures and the central wavelengths of the EUV multilayer films can be different; then designing an adjustable shielding coating tool which is in direct contact with the mirror surface of the reflecting mirror; the EUV wave band is plated on the surface of the cleaned reflecting mirror in a regional mode through an adjustable shielding film plating tool; and finally, testing the reflecting mirror after film coating. According to the invention, the boundary of the coating area is clear and has no shadow effect, and stray light crosstalk is reduced; and the film is good in film forming quality, small in film stress, excellent in optical performance, good in film firmness and high in space environment adaptability.

The invention belongs to the technical field of synthesis and preparation of high-molecular optical materials, and particularly relates to a multi-mercaptothiol composition as well as a preparation method and application thereof. According to the present invention, the three-step synthesis route of the tetrahydroxymethylation reaction, the thiol precursor introduction and the deprotection is adopted, the reaction conditions are mild, the steps are clear, the yield is high, the complexity of the traditional synthesis route is avoided, the production cost is reduced, and the industrial production is easily achieved. In the aspect of refractive index regulation and control, the compound contains a plurality of sulfur atoms, the coating is endowed with the characteristic of high refractive index, accurate regulation of the refractive index can be realized by adjusting the formula of the composition, the requirements of different optical applications are met, and the application range of the material is widened. The prepared optical coating has excellent light transmittance, light loss can be reduced to the maximum extent, and the efficient performance of an optical device is ensured; meanwhile, the haze value of the coating is low, the light scattering phenomenon is effectively avoided, and the imaging definition and the precision of an optical system are guaranteed.

The application discloses a kind of view angle controllable backlight module and liquid crystal display, the backlight module includes: light guide plate;Diffusion film, diffusion film is set above light guide plate;Prism brightening film, prism brightening film is set above diffusion film;Polarization brightening film, polarization brightening film is set above prism brightening film;Optical coating glass, optical coating glass is set above polarization brightening film, for reflecting specific direction large-angle light;Liquid crystal screen, liquid crystal screen is set above optical coating glass.The application is inserted between the DBEF film and liquid crystal screen of traditional backlight module by special optical coating glass, make large-angle light in a specific direction reflect back backlight system, that is, with similar and the function of anti-peep film to large-angle stray light suppression.Due to the light that is reflected is reused in backlight system, its light efficiency is higher than anti-peep film;Will not be interfered with display pixel and produce moire, and display effect is good.

The invention discloses an optical coating rubbing coating as well as a preparation method and application thereof, and belongs to the technical field of coatings. The coating comprises a first treating agent layer, a colored paint coating layer, a UV primer layer, an optical coating layer, a second treating agent layer, a PU intermediate paint layer, a gold stamping layer, a third treating agent layer and a UV finish paint layer. The structure of the optical coating layer is five, and the material of the optical coating layer comprises silicon dioxide, lithium sesquioxide, silicon dioxide, lithium sesquioxide and silicon dioxide metal overlapped coating layers which are sequentially coated on the UV primer layer. The preparation method of the coating comprises the following steps: sequentially spraying the first treating agent layer, the colored paint coating layer and the UV primer layer on the surface of the base material, carrying out optical coating, continuously spraying the second treating agent layer and the PU intermediate paint layer, carrying out gold stamping treatment, continuously spraying the third treating agent layer and the UV finish paint layer. Through the synergistic effect of different components, the adhesive force of the coating is improved, and meanwhile the coating has the good metal texture and the high-texture visual effect.

The invention discloses an optical coating, a manufacturing method of the optical coating and a projection screen, relates to the technical field of projection display, and aims at solving the problem that speckles of an existing projection screen are relatively serious. The optical coating is used for manufacturing a film layer for forming a projection screen and comprises an oily organic resin emulsion, an organic solvent and a matting material. Oily organic resin emulsions are used to form base solutions for optical coatings. The organic solvent and the oily organic resin emulsion are mixed with each other. The extinction material is mixed in the oily organic resin emulsion and the organic solvent. The extinction material is used for scattering the light passing through the extinction material. The optical coating is used for improving the quality of a projection picture.

Techniques and / or systems are disclosed herein for forming a window cavity wafer that includes fabricating a window wafer by: providing a window wafer substrate having two faces; etching fiducials onto one or more faces of the window wafer substrate; and applying one or more optical coatings to on one or more faces of the window wafer substrate. Next, fabricating a spacer wafer separate from the window wafer by: providing a spacer wafer substrate having two faces; and forming an array of through-holes in the spacer wafer substrate. Then, bonding the spacer wafer to the window wafer to form the window cavity wafer; and forming discrete metal frames on a face of the window cavity wafer.

This invention belongs to the field of optical functional thin film materials, specifically relating to a silicon-oxygen-aluminum ternary composite optical coating material and its preparation method. Addressing the problem in existing technologies of achieving high transmittance, high hardness, and corrosion resistance synergistically within a single ternary material system, this invention utilizes a single-crystal thin film with a completely ordered single-phase structure epitaxially grown on a MgAl2O4 spinel single-crystal substrate, co-doped with transition metal ions and protons. Employing a combined laser molecular beam epitaxy and low-temperature proton implantation technique, alternatingly ablates the silicon target, aluminum target, and doped target, and simultaneously irradiating with a low-energy hydrogen ion beam under ultra-high vacuum, atomic-level epitaxial growth and in-situ proton embedding are achieved, resulting in a unified high transmittance, high hardness, and corrosion resistance.

The application discloses an online full-wavelength detection system for continuous vacuum coating, a transfer unit is used for conveying a coated sample to a next vacuum coating unit, the transfer unit can convey the coated sample to a specified position of a detection module, and light emitted by a light source module enters a light collecting mechanism after passing through the coated sample. The application can satisfy online full-wavelength detection of continuous coating, can detect optical performance changes after coating in real time, and then adjust optical coating parameters to achieve ideal optical coating effect. The method can greatly improve the yield of multilayer continuous coating. Meanwhile, the second window of the light collecting mechanism and the first window of the light source module are arranged to be inclined at a specified angle, so that reflected light on the upper surface and the lower surface of the coated sample can be effectively prevented from entering the integrating sphere, background interference is effectively reduced, sensitivity is improved, and the optical differences of the coated sample after coating of each layer can be effectively found, so that parameter guidance for the next layer of coating is provided.

The application discloses an optical coating process cavity and a multi-cavity continuous vacuum coating machine thereof. The optical coating process cavity comprises a cavity, the cavity is provided with an outlet and an inlet, the outlet and the inlet of the cavity are arranged on two adjacent surfaces of the cavity, an arc-shaped cavity wall is arranged at a position opposite to the intersection of the surfaces where the outlet and the inlet of the cavity are located, the center of the circumference where the arc-shaped cavity wall is located coincides with the rotation center of a rotating frame in the cavity, a coating assembly is arranged on the arc-shaped cavity wall, the arc-shaped cavity wall is deviated to one side of the cavity, and space is reserved on the other side as a mounting wall of a matched device. The multi-cavity continuous vacuum coating machine comprises a pretreatment cavity, at least one optical coating process cavity and a post-treatment cavity which are connected in sequence, and the inlet of the pretreatment cavity and the outlet of the post-treatment cavity are connected through a connecting platform. The coating efficiency is high.

The invention provides a high-toughness deep-texture multi-layer visual effect composite board and a preparation method and application thereof, and belongs to the technical field of composite material preparation, and the method comprises the following steps: selecting a base material layer and carrying out base material pretreatment; forming a UV transfer printing texture layer on the surface of the base material layer; depositing an optical coating layer on the UV transfer printing texture layer; coating a color ink layer; covering a color cover bottom layer; preparing a deep-texture high-transmittance PU appearance layer; the PU appearance layer and the obtained structure are compounded through high-transmittance UV glue; performing surface treatment; and curing and molding. The manufactured composite board has the advantages of optical texture, folding resistance, water resistance, ultraviolet resistance, wear resistance, high and low temperature resistance and the like, through the structural design of optical coating, UV texture transfer printing, the high-transmittance PU layer and the like, the composite board with the hand feeling being deep texture and the vision being optical double texture is prepared, operation is easy, cost is low, and large-scale production can be achieved.

The invention discloses an intelligent control method and system for optical coating equipment, relates to the field of intelligent control of the optical coating equipment, is used for improving the coating precision and stability of a complex multi-layer film system, and comprises the following steps: obtaining recorded data; the recorded data comprises a real-time optical signal intensity value output by an optical film thickness monitoring system in a film coating process and a deposition parameter of a current layer; determining a drift difference value according to the recorded data, and determining a drift rate according to the drift difference value; pre-judging the total drift amount of the optical film thickness monitoring system in the future deposition process according to the drift rate and the remaining layer number to be deposited; and according to the total drift distance, adjusting target optical thicknesses of the current layer and the subsequent layer, evaporation process parameters and an end point judgment basis of a monochromatic monitoring signal.

The utility model discloses an optical coating cutting device which comprises a working table, a portal frame is arranged above the working table, one side of a first movable plate at the top of the portal frame is connected with a movable rotary cutting device, the movable rotary cutting device comprises a vertical plate, and the vertical plate is connected with one side of the first movable plate. A second servo motor is installed on one side of the vertical plate through a motor installation frame, the output end of the second servo motor is connected with a first driving belt wheel, a ball screw is rotationally connected between the two bearing seats, the top of a screw of the ball screw is connected with a first driven belt wheel, and a second linear guide rail is installed on the other side of the vertical plate. A second moving plate is connected to the second linear guide rail and one side of a nut of the ball screw, a third servo motor is mounted on one side of the second moving plate through a motor mounting frame, and the output end of the third servo motor is connected with a second driving belt wheel; the problems that common colored glass cutting equipment is insufficient in cutting precision, low in machining efficiency and poor in adaptability are effectively solved.

The present invention proposes a fitting method for the ultra-low reflectivity of optical coatings to solve the technical problem of large measurement errors in the ultra-low reflectivity of optical coatings. The steps of the present invention are as follows: simulating and calculating the effective refractive index of the waveguide of an uncoated FP laser chip at both ends to obtain the reflectivity of the uncoated FP laser chip and air; performing a P-I test on the uncoated FP laser chip at both ends to obtain a threshold current; performing an ultra-low optical coating on one end of the uncoated FP laser chip to obtain a laser chip with one end coated; applying different current values ​​to the laser chip with one end coated according to the threshold current and testing the corresponding spectral curves; using the spectral curves under different current values, the reflectivity of the ultra-low optical coating is obtained according to the reflectivity fitting. The present invention can accurately estimate the ultra-low reflectivity of the optical coating, playing a decisive role in the optimization of SLD and SOA products.

An electronic device is provided. The electronic device includes a cover including a transparent portion, an optical sensor that is spaced from the cover and includes a light-emitting portion configured to transmit first light portions to the outside through the transparent portion of the cover and at least one light-receiving portion spaced from the light-emitting portion, configured to receive second light portions through the transparent portion, and surrounding the outside of the light-emitting portion, a first optical coating disposed on one surface of the transparent portion and facing the light-emission portion, and a second optical coating spaced from the first optical coating, disposed on one surface of the transparent portion, and facing the at least one light-receiving portion. The first optical coating includes patterns that are concentric around a location overlapping the light-emitting portion.

The invention relates to the technical field of photovoltaic cells, in particular to an optical coating composition, a photovoltaic cell piece and a photovoltaic module. The optical coating composition comprises a component A, a component B and a component C, the component A comprises one or more compounds with the structure shown in the following formula I; in the formula I, R1 is selected from H, an aryl-substituted functional group, or a substituted or unsubstituted alkenyl ether group, and R2 is selected from alkoxy, an aryl-substituted functional group, and substituted or unsubstituted C1 to C13 alkylene; n and m are respectively and independently selected from 0 or 1 or 2; the component B comprises one or more of an epoxy monomer, an oxetane monomer or a vinyl ether monomer; and the component C comprises one or more initiators. The optical coating composition provided by the invention has excellent transparency and high refractive index, and can solve the problem of refractive index mismatch of a photovoltaic cell and a packaging material.

The invention discloses an optical coating material uniform mixing device, and relates to the technical field of optical coating material preparation equipment.The optical coating material uniform mixing device comprises a box body and a gear motor fixedly connected to the top of the box body, the output end of the gear motor is fixedly connected with a driving shaft, and the end, away from the gear motor, of the driving shaft penetrates through the box body; the top end of the outer arc wall of the driving shaft is sleeved with a sleeve shaft, the sleeve shaft is fixedly connected to the inner wall of the top of the box body, and a plurality of stirring filter plates distributed in an annular array are fixedly connected to the outer arc wall of the sleeve shaft; according to the coating device, large particles are intercepted through the stirring filter plate, meanwhile, under the action of the scraping plate, the large particles intercepted by the stirring filter plate are scraped to the sleeve shaft, and the large particles are crushed under the extrusion of the scraping plate and the sleeve shaft, so that various materials are mixed more uniformly, various problems occurring during coating are reduced, and the coating quality is improved. Meanwhile, due to the design that one side of each filter hole is wide and the other side of each filter hole is narrow, stirring liquid can pass through the filter holes more quickly during stirring, and the stirring effect is further enhanced.

The invention discloses eye-protecting TFT (thin film transistor) liquid crystal panel glass, a preparation method and a liquid crystal display screen, and the preparation method comprises the following steps: cutting white glass, performing edging and chemical strengthening treatment to form TFT liquid crystal panel glass, and cleaning the TFT liquid crystal panel glass; manufacturing five liquid crystal display film layers on the inner side of the cleaned TFT liquid crystal panel glass; eight optical film layers which are stacked layer by layer and are different in thickness are designed on the outer side of cleaned TFT liquid crystal panel glass, optical film coating of the TFT liquid crystal panel glass is completed, the transmissivity of the TFT liquid crystal panel glass obtained after film coating is made to be larger than or equal to 94.5%, and the illumination perspective wavelength range is 630-750 nm. The eye-protecting TFT liquid crystal panel glass is prepared by the preparation method. The liquid crystal display screen comprises the eye-protecting TFT liquid crystal panel glass. The liquid crystal display screen of the prepared TFT liquid crystal panel glass has a good eye protection effect, so that the eyes can see display devices and the display screen more clearly and more easily, the eyes are better protected, the naked eye vision is improved, the blood circulation is accelerated, and the vision is healthier.

A coated article is described herein with a substrate having a major surface that comprises a first portion and a second portion that is curved or faceted; and an optical coating on the major surface that forms an anti-reflective surface. A first direction is normal to the first portion and is not equal to a plurality of second directions that are normal to the second portion, and the angle between the first direction and each of the second directions is from about 10 degrees to 60 degrees. Further, the coated article exhibits at the first and second portion a hardness of about 8 GPa or greater at an indentation depth of about 100 nm or greater. Further, the coated article exhibits a single side maximum reflectance of about 3% or less as the first and second portion, wherein the reflectance is measured in a range from about 425 nm to about 950 nm.

The application discloses a grating coupler, an optical waveguide device and a display device. The grating coupler couples input light incident thereon into a waveguide substrate and makes it propagate in the waveguide by total reflection, and comprises a grating body and an optical coating. The grating body comprises a plurality of unit structures arranged according to a predetermined grating period, and the optical coating covers the grating body and comprises one or more film layers. The grating coupler has one or more grating vectors, and the average thickness of at least one film layer in the optical coating gradually decreases in the direction of the at least one grating vector within a single grating period. By adopting the optical film layer with the thickness gradually decreasing in the coupling-in direction / grating vector direction, the grating coupler has a higher positive first-order diffraction efficiency in the upstream area of the coupling-in direction / grating vector direction and a lower coupling-out loss in the downstream area, so that the overall coupling-in efficiency of the grating coupler is maximized.